. >> while george w. bush was president, the government changed some of the laws that protected the nation's drinking water. >> ♪ so it all goes back to 2005 ♪ ♪ bush said gas drillers didn't have to comply ♪ ♪ with the safe drinking water act ♪ ♪ before too long it was "frack, baby frack" ♪ ♪ until the break of dawn >> with fracking that's not properly regulated comes another threat -- the release of toxic gas into the air. >> so, on top of the drinking water being contaminated and undrinkable, the air is also posing a serious health problem, as well. >> alex is from the environmental working group. they want to prevent pollution. rachel works for a company that represents the gas industry. they want to help america benefit from an important source of fuel. both sides probably agree on one thing... >> ♪ now, it's not that drillers should never be fracking ♪ ♪ but the current regulation is severely lacking ♪ ♪ reduce the toxins, contain the gas and wastewater ♪ ♪ and the people won't get sick ♪ ♪ and the planet won't get hotter, hotter, hotter ♪ >> it'